Siemens NK8235

Structure and functions
4
NK823x hardware
28
Building Technologies A6V10062437_a_en
Fire Safety & Security Products 30.06.2013
Internal DIP switch and jumpers (NKM8001-A2 mainboard)
Item Name Description
1 S101 DIP-Switches
2 S1 Reset button
3 S2 Tamper switch
4 X115 When closed, it disables the box tamper alarm.
4.2.4 Serial interfaces
 NK8231.2 , NK8232.2 , NK8235.2 : these models are equipped with two serial lines
available on the main board.
 NK8235.4 : this model is equipped with 4 serial interfaces (two on the main board
and two on an expansion module). COM3 and COM4 do not support the hardware-
handshaking signals for modem control (Rx, TX, and GND only).
Note: In all NK823x models, the first and the second serial port can be configured as
an RS232 interface using connector COM1 and COM2, or as an RS485 interface
using connectors X104 and X105.
All lines are fully RS232 compliant and have EMC/ESD protection.
No galvanic isolation is provided; all serial lines have a common ground.